adding abilities, created skill tree template and unlock mechanics

api/app/data/abilities/divine_blessing.yaml

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+# Divine Blessing - Oathkeeper Redemption ability
+# Stat buff + HoT
+
+ability_id: "divine_blessing"
+name: "Divine Blessing"
+description: "Bless an ally with divine power, increasing their stats and healing over time"
+ability_type: "spell"
+base_power: 0
+damage_type: null
+scaling_stat: "wisdom"
+scaling_factor: 0.5
+mana_cost: 35
+cooldown: 4
+is_aoe: false
+target_count: 1
+effects_applied:
+  - effect_id: "blessed"
+    name: "Divine Blessing"
+    effect_type: "buff"
+    duration: 4
+    power: 15
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "divine_blessing"
+  - effect_id: "blessed_healing"
+    name: "Blessed Healing"
+    effect_type: "hot"
+    duration: 4
+    power: 10
+    stat_affected: null
+    stacks: 1
+    max_stacks: 1
+    source: "divine_blessing"